I liked Barcelnoa Graffiti because most of what I saw was contained to doors and windows Not much of what I saw were on the walls especially in the Old Gothic section of the city, which most of these images were taken.
I'm not really a street graffiti artist as I prefer the studio walls but there is something about some graffiti art that I enjoy and that goes for shop signs as well. Paris has a different style and if you are looking at the right time and place you will find some good examples.